Battery cell and method of manufacturing same

Abstract

A battery cell includes: a resin insulator having a first portion, a second portion, and a third portion, the first portion being a portion that insulates a terminal portion and a sealing plate from each other outside an exterior container, the second portion being a portion that insulates a current collector and the sealing plate from each other inside the exterior container, the third portion being a portion that has a tubular shape and that communicates with an electrolyte solution injection hole, wherein the third portion of the resin insulator includes a shielding portion that shields between at least a portion of the electrolyte solution injection hole and an electrode assembly, and the first portion, the second portion and the third portion of the resin insulator are molded to be integrated together.

What is claimed is: 
     
         1 . A battery cell comprising:
 an electrode assembly including a positive electrode plate and a negative electrode plate;   an exterior container that is provided with an opening and that accommodates the electrode assembly;   a sealing plate that is provided with a terminal portion insertion hole and an electrolyte solution injection hole and that seals the opening of the exterior container;   a terminal portion that extends through the terminal portion insertion hole;   a current collector electrically connected to the positive electrode plate or the negative electrode plate; and   a resin insulator having a first portion, a second portion, and a third portion, the first portion being a portion that insulates the terminal portion and the sealing plate from each other outside the exterior container, the second portion being a portion that insulates the current collector and the sealing plate from each other inside the exterior container, the third portion being a portion that has a tubular shape and that communicates with the electrolyte solution injection hole, wherein   the third portion of the resin insulator includes a shielding portion that shields between at least a portion of the electrolyte solution injection hole and the electrode assembly, and   the first portion, the second portion, and the third portion of the resin insulator are molded to be integrated together.   
     
     
         2 . The battery cell according to  claim 1 , wherein the terminal portion and the resin insulator are integrated together by insert molding. 
     
     
         3 . The battery cell according to  claim 1 , wherein at least a portion of a contact surface of the terminal portion or the sealing plate with the resin insulator has a rough surface. 
     
     
         4 . The battery cell according to  claim 1 , wherein
 the terminal portion and the resin insulator are integrated together by insert molding, and   at least a portion of a contact surface of the terminal portion or the sealing plate with the resin insulator has a rough surface.   
     
     
         5 . The battery cell according to  claim 1 , wherein the shielding portion includes a strip-shaped portion formed to extend across the third portion having the tubular shape. 
     
     
         6 . The battery cell according to  claim 5 , wherein a through hole is formed in the strip-shaped portion of the shielding portion. 
     
     
         7 . The battery cell according to  claim 5 , wherein the strip-shaped portion includes a first strip-shaped portion extending in a first direction and a second strip-shaped portion extending in a direction intersecting the first direction. 
     
     
         8 . The battery cell according to  claim 1 , wherein
 the terminal portion and the resin insulator are integrated together by insert molding, and   the shielding portion includes a strip-shaped portion formed to extend across the third portion having the tubular shape.   
     
     
         9 . The battery cell according to  claim 1 , wherein
 the terminal portion and the resin insulator are integrated together by insert molding,   at least a portion of a contact surface of the terminal portion or the sealing plate with the resin insulator has a rough surface, and   the shielding portion includes a strip-shaped portion formed to extend across the third portion having the tubular shape.   
     
     
         10 . The battery cell according to  claim 1 , wherein the shielding portion includes a portion formed to have a substantially polygonal shape. 
     
     
         11 . The battery cell according to  claim 1 , wherein
 the terminal portion and the resin insulator are integrated together by insert molding, and   the shielding portion includes a portion formed to have a substantially polygonal shape.   
     
     
         12 . The battery cell according to  claim 1 , wherein
 the terminal portion and the resin insulator are integrated together by insert molding,   at least a portion of a contact surface of the terminal portion or the sealing plate with the resin insulator has a rough surface, and   the shielding portion includes a portion formed to have a substantially polygonal shape.   
     
     
         13 . The battery cell according to  claim 1 , wherein the shielding portion is formed only on one side with respect to a center of the third portion having the tubular shape. 
     
     
         14 . The battery cell according to  claim 1 , wherein
 the terminal portion and the resin insulator are integrated together by insert molding, and   the shielding portion is formed only on one side with respect to a center of the third portion having the tubular shape.   
     
     
         15 . The battery cell according to  claim 1 , wherein
 the terminal portion and the resin insulator are integrated together by insert molding,   at least a portion of a contact surface of the terminal portion or the sealing plate with the resin insulator has a rough surface, and   the shielding portion is formed only on one side with respect to a center of the third portion having the tubular shape.   
     
     
         16 . A method of manufacturing a battery cell, the method comprising:
 forming an electrode assembly including a positive electrode plate and a negative electrode plate;   electrically connecting the positive electrode plate or the negative electrode plate and a current collector to each other;   attaching a terminal portion and a resin insulator to a sealing plate provided with an electrolyte solution injection hole;   connecting the current collector and the terminal portion to each other;   accommodating the electrode assembly in an exterior container provided with an opening;   sealing the opening of the exterior container with the sealing plate; and   injecting an electrolyte solution into the exterior container via the electrolyte solution injection hole, wherein   the resin insulator has a first portion, a second portion, and a third portion, the first portion being a portion that insulates the terminal portion and the sealing plate from each other outside the exterior container, the second portion being a portion that insulates the current collector and the sealing plate from each other inside the exterior container, the third portion being a portion that has a tubular shape and that communicates with the electrolyte solution injection hole,   the third portion of the resin insulator includes a shielding portion that shields between at least a portion of the electrolyte solution injection hole and the electrode assembly, and   the first portion, the second portion, and the third portion of the resin insulator are molded to be integrated together.   
     
     
         17 . The method of manufacturing the battery cell according to  claim 16 , wherein the terminal portion and the resin insulator are integrated together by insert molding. 
     
     
         18 . The method of manufacturing the battery cell according to  claim 16 , further comprising providing a rough surface in at least a portion of a contact surface of the terminal portion or the sealing plate with the resin insulator. 
     
     
         19 . The method of manufacturing the battery cell according to  claim 16 , wherein the terminal portion and the resin insulator are integrated together by insert molding,
 the method further comprising providing a rough surface in at least a portion of a contact surface of the terminal portion or the sealing plate with the resin insulator.